1 #ifndef __ASM_HARDIRQ_H
2 #define __ASM_HARDIRQ_H
3
4 #include <linux/config.h>
5 #include <linux/threads.h>
6
7 /* entry.S is sensitive to the offsets of these fields */
8 typedef struct {
9 unsigned int __softirq_active;
10 unsigned int __softirq_mask;
11 unsigned int __local_irq_count;
12 unsigned int __local_bh_count;
13 unsigned int __syscall_count;
14 } ____cacheline_aligned irq_cpustat_t;
15
16 #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
17
18 /*
19 * Are we in an interrupt context? Either doing bottom half
20 * or hardware interrupt processing?
21 */
22 #define in_interrupt() ({ const int __cpu = smp_processor_id(); \
23 (local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
24
25 #define in_irq() (local_irq_count(smp_processor_id()) != 0)
26
27 #ifndef CONFIG_SMP
28
29 #define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
30 #define hardirq_endlock(cpu) do { } while (0)
31
32 #define irq_enter(cpu,irq) (local_irq_count(cpu)++)
33 #define irq_exit(cpu,irq) (local_irq_count(cpu)--)
34
35 #define synchronize_irq() do { } while (0)
36
37 #else
38 #error SMP not supported
39 #endif /* CONFIG_SMP */
40
41 #endif /* __ASM_HARDIRQ_H */
42
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